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The chiral separation of β-blockers on cellulose tris (3,5-dimethylphenylcarbamate) columns is described. The separation power of a Chiracel OD normal phase column, a Chiracel OD-RH reversed phase column, and a Chiracel ODRH reversed phase narrow-bore column were compared. Hexane–2-propanol–diethylamine mixtures were used as mobile phase in the normal phase mode and sodium perchlorate buffer containing different amounts of acetonitrile in the reversed phase mode. Sixteen μ-blockers were resolved under normal phase conditions and eleven under reversed phase conditions. The values of α and Rs on normal phase column ranged from 4.46 to 1.10 and 10.04 to 0.97, respectively. The values of α and Rs on reversed phase columns varied from 4.04 to 1.04 and 3.98 to 0.40(on normal bore column) and 4.36 to 1.06 and 2.26 to 0.40(on narrow bore column).

The chiral resolution of 1-[(benzofuran-2-yl)-5-nitrophenylmethyl] tetrazole (I) and 1-[(benzofuran-2-yl)-5-bromophenylmethyl] tetrazole (II), the novel aromatase inhibitors, has been achieved on Chiracel OD, Chiracel OD-RH columns which are coated with cellulose [tris (3,5-dimethylphenyl carbamate)]and Chiracel OJ-R column coated with cellulose [tris(4-methyl benzoate)]. The mobile phases used were hexane-2-propanol (95:5) on Chiracel OD and water-acetonitrile(45:55) on Chiracel OD-RH and Chiracel OJ-R columns respectively. Compound I has been resolved on Chiracel OD(α = 1.30 and Rs = 3.13) and OD-RH (α = 1.15 and Rs = 1.20)columns while compound II has been resolved on OJ-R(α = 1.31 and Rs = 1.80) column only. The effect of acetonitrile concentration in water-acetonitrile mobile phase was studied on the retention and resolution of both compounds.